中心体

In this paper, the experiment results in the strength of two spectral series depending on the concentration of sensibilizer Terbium have been analysed.

可见对于铽的绿色谱线而言，铽离子本身也会起一种敏化作用。据此，我们提出了三价铽离子具有自敏化效应的观点，来解释上述的实验结果，这种观点是：在含有较高浓度铽离子的磷光体中，铽离子既是绿色辐射的发光中心，又是它的敏化中心。

So in theory, the numbers of bound states should be more and more versus the width of well becomes wider.

如果磁场足够大，三维体材料中D~-中心有无穷多个束缚态，而二维D~-中心则只有四个束缚态存在。

The central atom is bridged to each ofthe two external copper atoms through triple triazole ligands.

在5的配阳离子中，中心铜离子处在反对称中心与六个admtrz桥的六个氮原子形成拉长的八面体配位环境。

It was found that the binaphthyl backbone of S configuration was matched to the S, S pyrrolidino group. In this case, the asymmetric allylation product could be obtained in 85. 6% ee.

轴手性是S构型时，和中心手性S，S构型相匹配，它和钯形成的络合物在催化烯丙基取代反应时，取得了比不含中心手性因素的吡咯烷基氮膦配体高得多的对映选择性，可以得到85.6％ee值的产物。

Results: Main CT appearances of this group of cases:①Ampullary carcinoma manifested as a small mass and was prone to protruding into duodenum, whereas the center of pancreatic head carcinoma was located in pancreas.

结果：本组病例的CT主要表现：①壶腹癌瘤体小，易向十二指肠腔突出，中心位于十二指肠腔内；胰头癌的中心则通常在胰腺内。

The coordination polyhedron around Ce3＋ is a distorted square antiprism, and the two independent molecules are connected by π-π stacking interactions to form a noncentrosymmetric dimer.

中心Ce3＋的配位多面体为变形双帽四方反棱柱，两个分子之间以π-π堆积连接，生成一个非中心对称的二聚体。

Much better asymmetric induction was obtained with the catalysis of Ag /MAPs than with Ag /H〓-MAPs, and the binaphthyl backbone of R configuration was found to match to the S, S pyrrolidino group.

含有中心手性和轴手性两种手性因素的氮膦配体中，轴手性为R构型时，和中心手性S，S构型相匹配。

In this section, applying the method, from abstract to specific and from history to present, it analyzes the operation mechanism of urbanization economy affected by market mechanism; puts forward four theories of urbanization economy from economic perspective, including agriculture surplus and comparison advantage; non-agricultural industry; agglomeration economy and spillover effect, on this basis of the theories, it, on one hand, analyzes two kinds of internal mechanism in the chronologic operation of urbanization economies: increasing mechanism of urbanization economies in urban output industry; and changing mechanism from specialization to integration, which are the representations of the evolution of "mart" development; on the other hand, it analyzes two internal mechanism of dimensional operation of urbanization economy: internal spatial enlargement mechanism of urbanization economies from monocentric city to multi-center city, and external spatial enhancement mechanism which represents city-regionalization and city-chain connection, the later two mechanism represent the evolution of "polis" development.

这一部分，按照由抽象到具体和由历史到现代的研究方法，分析了市场机制作用下的城市化经济运行机理，从经济学角度提出了农业剩余与比较优势、非农产业、聚集经济、外溢效应四大城市化经济定理；在此基础上，一方面分析了城市化经济运行沿时间增长的两个内在内容提要机制：城市输出产业的城市化经济增长机制和从专业化到综合化的城市性质变迁机制，它们主要表现为&市&发展的延续；另一方面分析了城市化经济运行沿空间增长的两个内在机制：从单中心到多中心的城市化经济运行的内部空间扩展机理和表现为城市区域化、城市连绵体的城市化经济运行的外部空间扩展机理，它们主要表现为&城&发展的延续。

Fourteen porcine and 14 human thoracic functional spinal units with intact costotransverse and costovertebral articulations were used for biomechanical testing.

对标本在背侧方向和腹侧方向，在脊柱功能单元的上椎体正中矢状面中心加载剪切载荷，试验采用自动化光电子三维运动测量系统测量椎体旋转。

Access to the catalytic center and an unusual switch I movement in the dimeric structure support this finding.

二聚体中催化中心的入口和一种不寻常的开关运动支持了这一猜想，即易位子复合物之间的相互作用或蛋白质前体的潜在结合位点都是由这种二聚体的结构特点决定的。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。